feat(models): 实现机器学习模型训练框架

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- 添加核心抽象：Processor、Model、Splitter、Metric 基类
- 实现阶段感知机制（TRAIN/TEST/ALL），防止数据泄露
- 内置 8 个数据处理器和 3 种时序划分策略
- 支持 LightGBM、CatBoost 模型
- PluginRegistry 装饰器注册，插件式架构
- 22 个单元测试

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liaozhaorun

2026-02-23 01:37:34 +08:00

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